Alex,
the Loxone Touch and Touch Pure (Tree, Air and Air-Nano version) is build for the European standard Box (62mm) but that's not fitting for the US gang Boxes.
We are aware of this topic and will release a back board which will fit on a 1-gang and on a 2-gang US box where you can mount the Touch on after.
This will be a white plate and you will not see any screws or something like this.
There is no exact date yet for the release but it will be in the next 2-3 month.
If you need further details or assistants just get in touch with our Team.
Best Regards
Stefan